PKI Tutorials - Herong's Tutorial Examples - v2.32, by Herong Yang
Failing to Import Root CA Certificates to Mozilla Firefox
This section provides a tutorial example on how to import a root CA certificate into Mozilla Firefox. The import process failed with an error.
If I don't want to add a security exception to trust the Yahoo site when Firefox gives me the "Your Connection is not secure" error, I need to fix the error.
Since I know the root cause of this error is missing the root CA certificate, I can try to fix by importing the root CA certificate "DigiCert High Assurance EV Root CA" back into Mozilla Firefox from the certificate file I created earlier.
1. Repeat steps listed in the previous tutorial until you see the
2. Click the "Authorities" tab, since I want to import a CA (Certificate Authority) certificate.
3. Click the "Import" button. The "Select File containing CA certificate(s) to import" dialog box shows up.
4. Find and select \temp\DigitCer_Root_CA_pem.crt, which contains the "DigiCert High Assurance EV Root CA" certificate I created earlier.
7. Click the "Open" button to let Firefox import the certificate. Surprisingly, I got an error message box saying that "This certificate already installed as a certificate authority."
Why I am getting this error? I remember I deleted "DigiCert High Assurance EV Root CA" certificate from Firefox. Read the next section to find out the answer.
Table of Contents
Introduction of PKI (Public Key Infrastructure)
Introduction of HTTPS (Hypertext Transfer Protocol Secure)
Using HTTPS with Google Chrome
►Using HTTPS with Mozilla Firefox
Visiting "https" Website with Mozilla Firefox
Viewing Server Certificate in Mozilla Firefox
Server Certificate General Information
Viewing Server Certificate Path in Mozilla Firefox
Exporting Server Certificate to File in Mozilla Firefox
Viewing Pre-Installed Certificates in Mozilla Firefox
Listing of Trusted Root CA in Mozilla Firefox
Exporting Certificate to File from Mozilla Firefox
Deleting Root CA Certificates from Mozilla Firefox
Mozilla Firefox Displaying Certificate Error Page
Adding Security Exception in Mozilla Firefox
►Failing to Import Root CA Certificates to Mozilla Firefox
Certificate Trust Settings in Mozilla Firefox
HTTPS with IE (Internet Explorer)
Android and Server Certificate
Windows Certificate Stores and Console
RDP (Remote Desktop Protocol) and Server Certificate
macOS Certificate Stores and Keychain Access
Perl Scripts Communicating with HTTPS Servers
PHP Scripts Communicating with HTTPS Servers
Java Programs Communicating with HTTPS Servers
.NET Programs Communicating with HTTPS Servers
CAcert.org - Root CA Offering Free Certificates
PKI CA Administration - Issuing Certificates
Comodo Free Personal Certificate
Digital Signature - Microsoft Word
Digital Signature - OpenOffice.org 3